I bought this lens at last years Photographica in London but have just got round to using it. It came in a Copal 3S shutter and I assume it is a Tessar design. It covers 5x7 and is very sharp stopped down at f11 and beyond. I have been able to find out very little (nothing of use) about the manufacturer, when it was made or what/who it was made for. I believe it to be of Chinese origin but that's about all I know. It seems odd that that it should be in such a large shutter. I would expect a Copal 1 at this focal length and I did in fact buy this for its mint condition shutter.